HRP05/HRP11/HRP17 Accu-Steer Pump-Set
Kobelt Manufacturing Co. Ltd.
Rev D
HRP07-HRP11-HRP17_MANUAL
8 of 28
3
O
PERATION
The Kobelt HRP Hydraulic Reversing Pump-sets are designed to interface a hydraulic steering
system with electric or autopilot control. The output flow rate of the pump-set determines
the actuation speed of the steering cylinder.
The HRP (Hydraulic Reversing Pump-set) operates as follows (reference numbers below refer
to Figure 2):
•
As the motor (1) rotates CCW, oil from the gear pump (2) is pumped towards output
“A”.
•
This oil passes through the check valve (5) and goes to the output line (7).
•
The pressure at output “A” ensures t
he check valve (3) stays closed and manually opens
check valve (6).
•
Opening check valve (6) allows the returning oil from the steering cylinder to flow back
to the pump.
•
If the pressure at the pump suction “B” is less than the pressure in the make
-up line, oil
from the make up line will pass by the check valve (4). This prevents cavitation due to
any air that may be in the steering line.
•
When the pump stops turning all spring-loaded check valves return to the normally
closed position.
•
When the motor (1) rotates (CW) the reverse movement of the oil and valves takes
place.
